一、概述水质分析的任务就是如何评价水质。但水中物质极为复杂,不可能对水中所有的杂质都一一定性。只能就同类型的杂质用同一指标来说明它们的共同特性。例如,水中含有机物种类很多,很难对它们进行逐个分析,常常用耗氧量来表征水质情况。有机物污染 First, an overview of the task of water quality analysis is how to evaluate water quality. However, the material in the water is extremely complex and it is impossible to classify all the impurities in the water. Only with the same indicator of the same type of impurities to illustrate their common characteristics. For example, water contains many kinds of organic matter, it is difficult to analyze them one by one, often using oxygen consumption to characterize the water quality. Organic pollution